The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 03, 1983
Filed:
Jan. 12, 1981
Toyota Jidosha Kogyo Kabushiki Kaisha, Toyota, JP;
Abstract
A changeover valve unit for a power-assisted steering system includes input and output shafts arranged for relative rotation on aligned axes, a torsion bar interconnecting the shafts, a spool valve element surrounding the input shaft and arranged to be axially displaced in response to relative rotation of the shafts for controlling the supply of pressurized fluid to a hydraulic cylinder associated with the steering system, and a displacement mechanism for the spool valve element. The valve unit further includes an annular retainer member engaged with one end of the spool valve element to form an oil chamber, a compression spring assembled within the oil chamber to bias the spool valve element toward the displacement mechanism, and an annular orifice formed around the input shaft by means of the retainer member to permit the flow of fluid between the oil chamber and the interior of the spool valve element.